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* Re: c++/9807: Derived class object used as default parameter for base class reference requires explicit cast to reference to base class
@ 2003-03-05 22:06 bangerth
0 siblings, 0 replies; 2+ messages in thread
From: bangerth @ 2003-03-05 22:06 UTC (permalink / raw)
To: frank6thursday, gcc-bugs, gcc-prs, nobody
Synopsis: Derived class object used as default parameter for base class reference requires explicit cast to reference to base class
State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Wed Mar 5 22:06:50 2003
State-Changed-Why:
Confirmed. I think the compiler should accept this, but
no version of gcc does that. It works, though, if the
reference parameter is constant.
Here's a smaller code:
----------------------
struct A {
virtual ~A();
};
struct B : A {};
struct C {
C(A& a = B()){}
};
C c;
------------------------
This is what I get:
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ -c x.cc
x.cc:9: error: could not convert `B()' to `A&'
x.cc:7: error: in passing argument 1 of `C::C(A&)'
There's something more weird: If I remove the virtual
destructor, then I get the following error message:
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ -c x.cc
x.cc:9: error: could not convert `{}' to `A&'
^^^^
!!!!
x.cc:7: error: in passing argument 1 of `C::C(A&)'
That looks like real bogus!
W.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9807
^ permalink raw reply [flat|nested] 2+ messages in thread
* c++/9807: Derived class object used as default parameter for base class reference requires explicit cast to reference to base class
@ 2003-02-22 19:46 frank6thursday
0 siblings, 0 replies; 2+ messages in thread
From: frank6thursday @ 2003-02-22 19:46 UTC (permalink / raw)
To: gcc-gnats
>Number: 9807
>Category: c++
>Synopsis: Derived class object used as default parameter for base class reference requires explicit cast to reference to base class
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Feb 22 19:45:59 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: B Kerner
>Release: gcc version 3.1.1
>Organization:
>Environment:
--enable-threads
Thread model: posix
RH Linux 7.2
>Description:
The compiler generates the error:
invalid type `B' for default argument to `A&'
In function `int main()':
could not convert `B()' to `A&'
in passing argument 1 of `C::C(A&)'
For the code:
struct A
{
virtual ~A(){}
};
struct B : A
{
};
struct C
{
//Without workaround, the default parameter is not
//accepted.
C(A& a = B()){}
~C(){}
};
int main()
{
C c; //Uses workaround.
B b;
A& aRef = b; //Exhibits Normal polymorphic behavior.
}
>How-To-Repeat:
Define a base class.
Define a derived class.
Define a function that takes a reference to the base class as a parameter and set its default value to an object of the derived class created within the function parameter list.
void function(Base& b = Derived())
>Fix:
(A workaround)
Add an explicit cast in the derived class.
operator Derived::Base& (){return *this;}
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2003-03-05 22:06 UTC | newest]
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2003-02-22 19:46 frank6thursday
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